Quoted strings with variables

payload.lua

-- Ran into a bit of trouble sending quoted string payload to a REST API
--
-- Working examples of quoted strings with variables provided for reference
--
--> print('"'..u..'"')
--"myuser"
--> print('{ "username":"'..u..'" }')
--{ "username":"myuser" }
--> payload = '{ "username":"'..u..'", "password":"'..p..'" }'
--> print(payload)
--{ "username":"myuser", "password":"mypassword" }